Strength of Materials

Students begin by drawing diagrams of axial and transverse forces, bending moments in beams or bars subjected to concentrated loads, distributed loads and bending moments. They determine the geometric center, the moment of inertia and static moment in cross sections. They are taught the concepts and equations of fundamental strength of materials, allowing calculate stresses and deformations in structures of simple metallic components. The know of tensile strength of a material and the safety factor are presented in order to calculated the permissible stress of a component made by this material. The study of structural elements subjected to axial loads, torsional moments and bending moments with the support of graphical and analytical tools are taught, complemented with theoretical and practical exercises of practical engineering problems arranged in order of increasing difficulty. This study is strongly supported by practical work performed in class laboratory.

The teaching method of the course will be mostly student-centered, using structural components of daily use, which the student, alone or in a group, will have to analyze and understand, within the scope of mechanics concepts.
The bases for the introduction of the nuclear concepts involve the use of several types of methodologies of exposition and discussion. Thus, the following will be implemented:
– Exhibition of content using electronic presentations, to be made available to students as complementary documentation to support the UC;
– Visualization of multimedia content;
– Visualization of components and structural assemblies to support the UC;
– Visits to metallic structures in spaces surrounding ISEC.
Students will be presented with several challenges, contextualized in the various domains of the course. These challenges involve understanding the functioning of some structural elements applicable in everyday life, as well as the design, development and construction of structural elements for defined objectives.
In addition, exercises to apply each of the UC concepts will be solved, which will serve as a basis for the apprehension of knowledge and the development of challenges.

The strength of materials discipline study the behavior of structural elements used in the fields of mechanical engineering and metal taking into account the conditions of their use and the stresses to which they are subject. Obtain the more convenient shape and dimensions of materials to be used, which offers better performance, to withstand various types of external stresses applied to machines, parts of structures, etc … at the lowest possible cost and maximum safety. The strength of materials discipline must define clearly and precisely what is required to the student as a future engineer Skills: Understanding the concepts and procedures involved in selecting and sizing machines bodies and structural elements. Know and use measurement instrumentation and control. Learn to design mechanical components and reticulated structures

Static: internal and external loads, reticulated and truss structures, Ritter method. Efforts: normal, transverse, bending and torsional moments. ;Strength of materials: Normal stress, shear stress, displacement, strain, mechanical properties; elasticity and plasticity, Hooke’s law, stress-deformation diagrams for ductile and brittle materials, safety coefficient, yield criteria.;Structural elements subjected to axial loading Stress into bars axially loading. Saint-Venant principle. Bars elongation. Influence of temperature on elongation of the bars.;Structural elements subjected to torsional moment Pure shear. Torsion on elements with circular and non-circular cross section. Torsion in thin-walled open sections and in thin -closed sections. Power transmission. ;Study of structural elements subjected to bending Bending of beams straight axis: pure, shear and axial and bending. Bending combined with axial load. Bending combined with torsion. Shear stresses in bending.

The curricular unit works in two possible regimes: a) Continuous assessment; b) Assessment by final exam.

The distributed assessment regime is normal and is recommended for students. To access the distributed assessment, the student must meet the minimum attendance criterion of 75% in theoretical and theoretical-practical classes (except for students covered by special regimes). The final exam assessment system is intended for students who believe they are unable to attend most classes, such as students with working-student status or an equivalent situation. Until the second week of classes, the student chooses the assessment regime they wish to follow in the curricular unit.

a) Continuous assessment, the curricular unit incorporates the following components:

- (40%) - Realization and evaluation of a set of challenges that may involve research, experimentation, presentation and discussion to be carried out individually or in groups, and during the classes. The challenges will be presented in the form of a written report or other means of communication and exhibition, such as Poster, video,... In one of the challenges there will be a participatory evaluation, that is, part of the evaluation will be carried out by peers; A minimum of 50% in each challenge will be required to pass the UC in this assessment regime.

- (60%) completion of two written frequencies, in the form of solving practical cases, to be carried out the 1st Frequency in the 8th week and 2nd Frequency on the date of the normal exam. A minimum of 42.5% in each frequency of this assessment component will be required to pass the UC in this assessment regime.

In this assessment regime, attendance in 80% of the classes is mandatory (Theoretical+Theoretical-Practical+Laboratory Practices). Students who do not comply with this requirement are automatically transferred to the assessment system by exam.

b) Assessment by final exam

In the evaluation system by final exam there will be a written test that will be quoted for 20 values. The exam will be structured in a theoretical and a theoretical-practical part (case resolution)

NAO